Results 121 to 130 of about 177 (158)

Performance Prediction of a Single-Zone Vertical Feedwater Heater

ASME 2010 Power Conference, 2010
This paper represents a case study of a replacement single-zone vertical feedwater heater with a pump forward drains system. When replacing a feedwater heater, it is important to review, evaluate and adjust the NLL of the new heater since it may not be the same as the NLL of the existing heater in order to achieve the same performance, particularly ...
Eric Svensson, William Mirowski
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Dynamic Simulation on Feedwater Heater of Nuclear Power Plant

Advanced Materials Research, 2012
There is not only the flow of the single-phase fluid but also the mixed-flow of the gas-liquid fluid in the system. So, it is very necessary to study its operational characteristics. In this study, the low pressure heaters (LP heaters) in the feedwater system are simulated.
Chun Guo Wang, Rui Yu, Ke Long Zhang
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Selecting Shell Side Design Temperature for Feedwater Heaters

Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance; Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues, 2014
Operating temperature information was gathered using thermocouples installed on the outside of an existing high pressure feedwater heater (FWH). The operating data was collected to demonstrate the basis for the evaluation of the operational effectiveness of the heater especially during rapid load changes.
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The impact of fouling on performance evaluation of multi-zone feedwater heaters

Applied Thermal Engineering, 2007
A numerical method for analyzing closed system feedwater heaters is presented. A general approach to determine area allocations among the desuperheating, condensing and subcooling zones under a known set of operating conditions is presented for a feedwater heater in a steam power plant.
Mohamed A. Antar, Syed M. Zubair
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Level control in feedwater heater systems using nonlinear strategies

ISA Transactions, 1998
Abstract This paper deals with the level control of a horizontal closed feedwater heater in a power generation plant. Due to inherent nonlinearities in the system, conventional PI controllers are often tuned conservatively to preserve stability and hence result in suboptimal performance.
C. Thanomsat, C.W. Taft, A.M. Annaswamy
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Performance and Service Life Considerations—Closed Feedwater Heaters

Heat Transfer Engineering, 1987
Because of the potential restriction of plant capacity and increases in fuel consumption cost that result from the removal of closed feedwater heaters from service, there is a need for the application of new design and operation concepts that enhance both the thermal performance and the availability of heaters and their associated systems.
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Failure of Low Pressure Feedwater Heater Tubing-A Case History

CORROSION 1986, 1986
Abstract A work program consisting of failure analysis, laboratory tests and feed-water chemistry monitoring was carried out to determine the root cause of low pressure Admiralty brass feedwater heater failures and recommend ammeliorative solutions. The results of this failure analysis showed that the tubes failed due to a
A.V. Manolescu, F. Chiarotto, P. Mayer
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Prompt Leak Detection for High Pressure Feedwater Heaters

2002 International Joint Power Generation Conference, 2002
I. THE NEED. A. In high pressure feedwater heaters, a tube leak quickly claims several neighboring tubes as collateral victims. B. Prompt detection of the initial leak would save the neighboring tubes from damage and preclude a potential turbine water induction incident. II. EXAMPLE. A. A Midwest generating station replaced 12 old high pressure heaters.
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Optimizing Feedwater Heater Operation in a Nuclear Power Plant

ASME 2005 Power Conference, 2005
Feedwater heaters are a tough application even in a conventional power plant. Because of the complicated control scheme and the cascading effects between heaters, the levels in the heaters tend to cycle, reducing their ability to effectively transfer heat to the feedwater and wearing out many of the components that surround them. This situation is made
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Thermal modelling of feedwater heaters

2016
Manufacturers of feedwater heaters (FWHs) are obliged to disclose a specification sheet to the client that describes their FWH design. However, the client is unable to verify the performance of this FWH design without comparing it to the results that are predicted by a thermal model.
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